mm/damon/sysfs-schemes: protect memcg_path kfree() with damon_sysfs_lock

• azl3 kernel 6.6.139.1-1 on Azure Linux 3.0

Separate remediation guidance was not included in the collected bulletin.

1. May 29, 2026 at 1:09 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Jun 2, 2026 at 1:45 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

3. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

4. Nov 7, 2026 at 7:05 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.